单项选择题


Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now listen to the passage.
As for the speaker’s experiment, which statement is INCORRECT

A.The speaker used a pair of knife and folk in the experiment.
B.The speaker tried to have a change and get the food with the left hand.
C.It showed that that change would influence our mind.
D.It indicated that we needn’t change a left-hander to right-hander.